As the other commenter pointed out, they make up a much smaller fraction of the population and are still involved in a disproportionate amount of the overall committed crimes.

While those numbers undoubtedly disregard a variety of circumstances and factors that might affect the statistic, such as the possibility of race based prejudice causing foreigners to be easier suspected and in consequence investigated, it shows a very worrying trend over the last decade that likely contributed to the disastrous recent European election results.